Hair Today, Gone Today Create a jaw-dropping bald head effect on larger craniums with this Pre-Impression Cap from Kryolan! Made of Glatzan, this professional single-use bald cap is thin, colorless and tear-resistant, offering maximum size and color customization to special effects artists. A Bald Cap That Makes A Real Impression Pre-Impression Cap is a Bald Cap made from very soft, colorless Glatzan, originally designed to protect hair when a face cast or head impression using Alginate or Silicone MF is taken. This cap is also suitable for single use baldness effects. Small: This Pre-Impression cap measures 54-59cm across. Large: This Pre-Impression cap measures 58-64cm across.